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It is effectively data bound to the Resources property of the current Project object; meaning that it is bound to a collection of ProjectResource objects Remember that each type of business object must have its own CslaDataSource control in order to act as a data source The GridView control also has a ResourceId column, which is not visible Its DataKeyNames property is set to ResourceId, specifying that the ResourceId column contains the unique identifying value for each row The Name and Assigned columns are read-only, while the Role column is a TemplateField: <asp:TemplateField HeaderText="Role" SortExpression="Role"> <EditItemTemplate> <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="RoleListDataSource" DataTextField="Value" DataValueField="Key" SelectedValue='<%# Bind("Role") %>'> </asp:DropDownList> </EditItemTemplate> <ItemTemplate> <asp:DropDownList ID="DropDownList2" runat="server" DataSourceID="RoleListDataSource" DataTextField="Value" DataValueField="Key" Enabled="False" SelectedValue='<%# Bind("Role") %>'> </asp:DropDownList> </ItemTemplate> </asp:TemplateField> Notice how the DropDownList controls are data bound to the RoleListDataSource control shown in Figure 10-20.

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The reason why the high-profile failures are seldom due to this type of problem is because large sites make sure to provide redundancy in these areas Clearly, adding redundant power, network, ISP, DNS, or LAN hardware will have little impact on application architecture Adding redundant servers, on the other hand, will affect the n-tier application architecture or at least the application design Each time you add a physical tier, you need to ensure that you add redundancy to the servers in that tier Thus, adding a fault-tolerant physical tier always means adding at least two servers to the infrastructure The more physical tiers, the more redundant servers there are to configure and maintain This is why fault tolerance is typically expensive to achieve Not only that, but to achieve fault tolerance through redundancy, all servers in a tier must also be logically identical at all times.

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This data source control provides access to a RoleList business object, so the DropDownList controls are populated with the list of roles a resource can play on a project This way, ASPNET does all the hard work of mapping the Key values for each role to the corresponding human-readable text value The numeric Key values are stored in the business objects, while the text values are displayed on the page..

In listing 6.2, you define the URI of your long-running web page at q. Then you iterate through a loop 100 times, creating a new thread at w, which you ll spawn at r. You ll spawn 100 threads. Each thread will execute the code defined at w within the lambda expression. This thread will loop 30 times, making an asynchronous request to the web page at e. In the end, you should be making around 300 simultaneous requests to your website. How is the web server going to perform

The GridView control also has a CommandField column so the user can edit or remove assignments. Of course, remove in this case really means unassign, but those details are handled by the business object, not the UI. Finally, there s a LinkButton to allow the user to assign a new resource to the project. When the user clicks that button, the view is switched so that they see AssignView, where they can select the resource to assign. The layout of that view is shown in Figure 10-19.

In figure 6.1, you saw the response time of a simple AJAX website being polled every 5 seconds under normal load. In that example, there were no real issues and the page was served up with ease. Figure 6.2 shows that same web application, this time coughing and spluttering as it struggles to cope with the simulated extreme load. The extreme load that this page is suffering from is the result of running your console application (listing 6.2) at the same time as your polling application. Figure 6.2 AJAX poll under extreme load (running Figure 6.2 shows that your polling at the same time as your console application) web page is no longer consistently taking 5 seconds to return a result. At one point (between 18:40:33 and 18:41:04), it took more than 20 seconds to return the result. This type of response is typical of a web

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